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Embodied cognition has come of age and is now diversifying. In this paper, I discuss four different approaches within embodied cognition: a biogenic approach, an enactive approach, a sensorimotor approach and a scaffolding approach. The four approaches can be differentiated according to their commitments to either biology (biogenic and enactive approaches) and/or experience (enactive and sensorimotor approaches). I will argue that these differences are substantial, but that a reconciliation is possible and even desirable. Seen in this light, embodied cognition can remain a comparatively unified field, these diverging approaches notwithstanding.

In this paper we present a pulse sequence that combines a displacement-encoded stimulated echo with rapid sampling of k-space by means of turbo spin echo imaging. The stimulated echo enables the use of long observation times between the two pulsed field gradients that sample q-space completely. Propagators, constructed with long observation times, could discriminate slowly flowing protons from diffusing protons, as shown in a phantom in which a plug flow with linear velocity of 50microm/s could clearly be distinguished from stationary water. As a biological application the apparent diffusion constant in longitudinal direction of a transverse image of a maize plant stem had been measured as a function of observation time. Increasing contrast in the apparent diffusion constant image with increasing observation times were caused by differences in plant tissue: although the plant stem did not take up any water, the vascular bundles, concentrated in the outer ring of the stem, could still be discerned because of their longer unrestricted diffusional pathways for water in the longitudinal direction compared to cells in the parenchymal tissue. In the xylem region of a tomato pedicel flowing water could be distinguished from a large amount of stationary water. Linear flow velocities up to 0.67 mm/s were measured with an observation time of 180 ms.

Embodied cognition has come of age and is now diversifying. In this paper, I discuss four different approaches within embodied cognition: a biogenic approach, an enactive approach, a sensorimotor approach and a scaffolding approach. The four approaches can be differentiated according to their commitments to either biology (biogenic and enactive approaches) and/or experience (enactive and sensorimotor approaches). I will argue that these differences are substantial, but that a reconciliation is possible and even desirable. Seen in this light, embodied cognition can remain a comparatively unified field, these diverging approaches notwithstanding.

This paper presents a tryptophan phosphorescence spectroscopy study on the membrane-bound mannitol transporter, EII(mtl), from E. coli. The protein contains four tryptophans at positions 30, 42, 109, and 117. Phosphorescence decays in buffer at 1 degrees C revealed large variations of the triplet lifetimes of the wild-type protein and four single-tryptophan-containing mutants. They ranged from